Soft decks are caused by the wood under it rotting out due to wetness and lack of ventilation. Rot is not selective. As Smokeonthewater just said, most times when the deck is soft it means the wooden stringers are rotted also. Best of luck with your project. Do a search or two on this site for lots of threads by people that have had the same problem and how they went about fixing it.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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